RU2147964C1 - Method for winding springs with shaped end portions and apparatus for performing the same - Google Patents

Abstract

FIELD: plastic metal working, namely, manufacture of wire products. SUBSTANCE: method comprises steps of feeding wire until stopper, winding helical portion of spring onto mandrel, transferring wound spring to shaping zone, simultaneously forming two end portions of spring, cutting its right end and discharging ready product. Apparatus for performing the method includes mounted onto tool plate mechanisms for winding spring and discharging ready product, mechanisms for transferring, shaping and cutting. Shaping mechanism is in the form of two dies. Lower die has pilot members in the form of grooves. Transfer mechanism is in the form of stripping wedge and holder with cutter. Unit for controlling said mechanisms includes cams. EFFECT: enlarged manufacturing possibilities due to making springs with shaped ends placed near spring coils in the same plane normal relative to spring axis. 2 cl, 8 dwg

Description

 The invention relates to the processing of metals by pressure, in particular the production of wire products, and can be used in mechanical engineering - the manufacture of springs with shaped ends, in particular on bending machines.

 A known method of winding springs with shaped ends (see and.with. N 1284643. MKI B 21 F 3/027), in which before forming the spiral part of the spring produce a piece of wire while bending its ends.

 This technical solution has drawbacks in that the winding is carried out after bending its ends, as a result of which the position of the ends of the spring may not be in the same plane, which is not always permissible. With this method, it is impossible to obtain a spring with curly ends, the bend of which is located directly near the coil of the spring.

 There is also a method for winding springs with shaped ends (see A.S. N 1151346 MKI B 21 F 3/027), in which the wire in the initial position of the tool is fed all the way, the first end is bent, then the spiral part of the spring is formed and the finished part is cut spring, then bend the second end of the spring.

 The disadvantage of this invention is that the spring ends are flexible at different times and as a result, the position of the spring ends can be different. With this method, it is also impossible to obtain a spring with curly ends, the bend of which is located directly near the coil of the spring.

 A known machine for winding springs (see AS N 1125083, MKI B 21 F 3/027), containing mounted on the frame mechanisms for clamping the wire, winding the wire on the mandrel, the mechanism for shaping the end of the spring and the mechanism of cutting.

 The disadvantage of this invention is that its technological capabilities are limited, since the design of the machine is such that the spring ends are flexible before the spring is wound, as a result, the position of the spring ends after each winding can be different. On this machine it is also impossible to produce springs with curly ends close to the coil of the spring, lying in the same plane perpendicular to the axis of the spring.

 The closest in technical essence is a device for winding springs with shaped ends (see A.S. N 1326377, MKI B 21 F 3/027), in which the winding of the springs is performed according to the following cycle: first, the wire is fed all the way, spiral winding parts of the spring on the mandrel, a segment of the ends of the spring and its transfer to the forming zone, the formation of the ends of the spring and dumping the finished product. The device implementing this method includes a wire feed mechanism mounted on the bed, a cutting device, a mechanism for transferring springs from the winding mechanism of the springs on the mandrel to the mechanism of forming ends and dropping the finished product.

 This device also has limited technological capabilities, namely that the device is designed in such a way that a piece of wire is made at the winding position, after which it is transferred to the forming zone. The fixation of the wire wound on the mandrel is unreliable and the wire can rotate both at the time of its winding and at the time of transfer. As a result, the ends of the wire may not be bent in the plane that is needed. The design of this device also does not allow to produce springs with curly ends close to the coil of the spring, lying in the same plane perpendicular to the axis of the spring, which is not always acceptable.

 The technical problem to which the invention is directed is to expand technological capabilities by manufacturing springs with curly ends close to the coil of the spring, lying in the same plane and located in a plane perpendicular to the axis of the spring.

 The means of achieving the technical result consists in winding up the springs with shaped ends according to the following cycle: first, the wire is fed all the way, then the spiral part of the spring is wound onto the mandrel, the wound spring is transferred to the shaping zone, the two ends of the spring and the right segment are formed simultaneously end, then dumping the finished product from the mandrel.

 A device for implementing the method consists of spring winding and dumping mechanisms of a finished product mounted on a tool plate, transfer mechanisms, shaping and cuts, the shaping mechanism being made in the form of two matrices with a travel equal to the size of the wound spring, taking into account the subsequent molding, on the lower matrix catchers are made in the form of grooves, and the transfer mechanism is made in the form of a wedge puller and holder with a knife with a travel of equal to the size of the wound spring, taking into account the following forms and means for controlling the mechanisms designed as cams.

 In FIG. 1 shows a diagram of a method for winding springs with curly ends.

 In FIG. 2 - sketch of the spring.

 In FIG. 3 - a mechanism for winding wire onto a mandrel and dumping a wound spring.

 In FIG. 4 - transfer mechanism, shaping of the ends of the spring and the segment.

 In FIG. 5 is a general view of the device.

 In FIG. 6 is a view G of the bar 11 of FIG. 4.

 In FIG. 7 is a view D of the bar 10 of FIG. 4.

 In FIG. 8 is a view along arrow G in FIG. 4.

 A device for winding springs with curly ends consists of a tool plate 1, on which are located the winding and dumping mechanism of the finished product with a drive 2 and a stop 3, a mechanism for shaping the ends of the spring, transfer and lengths.

 The winding and dumping mechanism of the finished product consists of a gear shaft 4, in which a step mandrel 5 is mounted, with a sleeve 7 mounted on it with a spring 6, made with a tooth 8. The finished product was dumped into the drive using a wedge puller 9 (see Fig. 3).

 The mechanism for transferring a wound spring into the area of the mechanism of forming the ends of the spring and the segments is made in the form of a wedge puller and holder 10 with a knife 11, the movement of which is carried out along the guide bars 12 and 13 with bevels 14 and 15, the holder with bevels 16, 17 and 18, 19 wedge 20 with bevels 21 and 22 (see Fig. 4, 6, 7, 8).

 The mechanism of forming the ends of the spring and the segments consists of forming matrices 23 and 24. On the lower matrix 23 there are wire catchers in the form of grooves 25 and 26 (see Fig. 5).

 The mechanism of the cuts is made in the form of a knife 11 with a holder 10. Moving is carried out by the bevels 16, 17 and 18, 19 of the holder with a knife along the guide bars at a distance equal to the size of the end of the spring relative to the axis of the mandrel, taking into account subsequent shaping (see Fig. 4, 8) .

 The wire feed mechanism, spring winding, transfer to the shaping zone, spring ends formation, pieces and dumping of finished products are driven by cam mechanisms 27, which in turn receive movement through small gears 28 from the central gear 29 (see Fig. 1), driven by an electric motor (not shown).

 The device operates as follows. Straightened wire 30 (wire straightening mechanism not shown) is fed towards the winding mechanism through an opening in the holder 10 and knife 11 under the mandrel 5 and tooth 8 of the sleeve 7 to the stop 3. At this time, the holder 10 of the knife 11 is at a distance allowing the end of the wire 30 freely pass between the mandrel 5 of the winding mechanism, the holder 10 and the knife 11, and the wedge 20 is in the upper position.

 Then, the rotation of the pinion shaft 4 begins with the sleeve 7, which grabs the wire 30 with its tooth 8 and winds it around the mandrel 5, while the sleeve 7 moves to the right (Fig. 4) under the influence of the winding wire 30 and compresses the spring 6.

 After winding, the sleeve 7 with the tooth 8 is rotated on the mandrel 5 in the direction of the opposite winding and allows the coiled wire 30 to spring up, thereby the coils of the wire increase in diameter and freely "sit" on the mandrel 5. The remover wedge 9 is inserted between the coiled wire 5 on the mandrel 5 30 and the tool plate 1, moving the wire wound on the mandrel to the left (Fig. 5), and the sleeve 7 even further to the right. At the same time, the wedge 20 moves downward and interacts with its bevel 21 with the bevel 16 in the holder 10, which moves to the left by an amount equal to the size of the wound spring 30, relative to the axis of the mandrel 5, taking into account the subsequent molding. When moving to the left, the holder 10 with its bevels 18 and 19 interacts with the bevels 14 and 15 of the guide strips 12 and 13, moves to the left (view G in Fig. 4) together with the knife 11, while helping the wedge remover 9 to move the wire wound on the mandrel 5 thirty.

 Then the molding matrix 23 and 24 move towards each other, forming the ends of the wire 30, and first the matrix 23 with its grooves 25 and 26 catches the ends of the wire and cuts off its right end.

 After this, the matrices 23 and 24 diverge, the wedge 20 moves with its bevel 22 along the bevel 17 of the holder up and moves the holder 10 with the knife 11 to its original position, the mandrel 5 moves to the right (Fig. 3), and the wire wound on the mandrel rests on the wedge puller 9, is removed from the mandrel 5 and rolled into the drive. Then the mandrel 5, the sleeve 7 with the tooth, rotating together with the gear shaft 4 is returned to its original position.

 The coil winding cycle is repeated.

 The proposed device for winding springs with curly ends, mainly mounted on universal bending machines driven by a central gear, makes it possible to produce springs with long shaped ends close to the coil of a spring lying in the same plane and located in a plane perpendicular to the axis of the spring, which can be used in the automotive industry.

Claims (2)

 1. The method of winding springs with curly ends, including feeding the wire all the way, winding the spiral part of the spring onto the mandrel, cutting the spring end and transferring it to the shaping zone, forming the ends of the spring and dumping the finished product, characterized in that the spring end is cut at the same time the formation of the ends of the spring after transfer to the zone of formation.  2. A device for winding springs with curly ends, consisting of mechanisms for winding springs and dumping the finished product mounted on a tool plate, transfer mechanisms, shaping and cutting, and having means for controlling the mechanisms, characterized in that the shaping mechanism is made in the form of two matrices, on the bottom of which catchers are made; the mechanism of cutting - in the form of a knife with a holder; transfer mechanism - in the form of a wedge puller and holder with a knife with a travel equal to the size of the wound spring, taking into account subsequent molding, interacting with the bevels of the guide bars and the wedge, while the mechanism control mechanism is made in the form of cams.

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